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Keyword: invasion

Life in interstitial space: Biocrusts inhibit exotic but not native plant establishment in semi-arid grasslands

Publications Posted on: August 17, 2020
Exotic plant species commonly exploit disturbances more successfully than native plants. This outcome is widely attributed to the fact that disturbance reduces biotic resistance from native plant competitors. However, biocrusts, communities of mosses, lichens, and micro‐organisms, are a prominent component of semi‐arid grasslands occurring in the interstitial spaces between vascular plants.

Natural revegetation of abandoned crop land in the ponderosa pine zone of the Pike’s Peak region in Colorado

Publications Posted on: February 19, 2020
Cultivation in the ponderosa pine zone of Colorado has, in many instances, been unprofitable because of the uncertainty of crops and eventual loss of soil fertility. Consequently, many areas have been abandoned, and natural revegetation has resulted in the presence of all stages of the secondary succession, from the initial invasion to almost complete return to the original subclimax grassland community.

Got shrubs? Precipitation mediates long-term shrub and introduced grass dynamics in chaparral communities after fire

Publications Posted on: May 30, 2019
Background: Short-term post-fire field studies have shown that native shrub cover in chaparral ecosystems negatively affects introduced cover, which is influenced by burn severity, elevation, aspect, and climate.

The fluctuating resource hypothesis explains invasibility, but not exotic advantage following disturbance

Publications Posted on: September 26, 2018
Invasibility is a key indicator of community susceptibility to changes in structure and function. The fluctuating resource hypothesis (FRH) postulates that invasibility is an emergent community property, a manifestation of multiple processes that cannot be reliably predicted by individual community attributes like diversity or productivity.

Are invasive plants more abundant in the introduced versus native range?

Publications Posted on: September 26, 2018
Many invasion hypotheses postulate that introducing species to novel environments allows some organisms to escape population controls within the native range to attain higher abundance in the introduced range. However, introductions may also allow inherently successful species access to new regions where they may flourish without increasing in abundance.

Reduced mycorrhizal responsiveness leads to increased competitive tolerance in an invasive exotic plant

Publications Posted on: December 14, 2017
1. Arbuscular mycorrhizal (AM) fungi can exert a powerful influence on the outcome of plant–plant competition. Since some exotic plants interact differently with soil biota such as AM fungi in their new range, range-based shifts in AM responsiveness could shift competitive interactions between exotic and resident plants, although this remains poorly studied. 2.

The tortoise and the hare: Can the slow native plant win?

Science Spotlights Posted on: May 03, 2017
It has been suggested that exotic plants will be more successful than native plant species as a result of climate change. This is because exotics often exhibit stronger responses to disturbance, faster growth rates, and greater plasticity. In this study, we show that climate change can actually shift the balance in favor of natives when it creates conditions that favor the slower more "tortoise-like" strategies of some natives.

The tortoise and the hare: Reducing resource availability shifts competitive balance between plant species

Publications Posted on: April 14, 2017
Determining how changes in abiotic conditions influence community interactions is a fundamental challenge in ecology. Meeting this challenge is increasingly imperative in the Anthropocene where climate change and exotic species introductions alter abiotic context and biotic composition to reshuffle natural systems.

Native species richness buffers invader impact in undisturbed but not disturbed grassland assemblages

Publications Posted on: November 18, 2016
Many systems are prone to both exotic plant invasion and frequent natural disturbances. Native species richness can buffer the effects of invasion or disturbance when imposed in isolation, but it is largely unknown whether richness provides substantial resistance against invader impact in the face of disturbance.

The bane of weed management: Secondary invasions

FS News Posted on: August 03, 2016
Exotic plant invaders are global threats to ecosystems and millions of dollars are spent each year to fight invasions. A new study shows that current treatment methods could inadvertently promote a second invasion by exotic plants instead of desired native plants and negatively impact ecosystem restoration.